SU1214903A1 - Bladed hole-sizing tool - Google Patents

Description

" one

The invention relates to a drilling technique, namely, a rock-eroding tool for calibrating wells.

The purpose of the invention is to increase the durability and increase the efficiency of the calibrator.

FIG. 1 shows schematically the proposed calibrator, a general view; FIG. 2 is a section A-A in FIG. 1;

The calibrator contains an α1 hollow body, the internal cavity of which through the channels 2 communicates with the calibrating surface of the blades 3, mounted on the housing 1. On the calibrating surface of the blades 3, longitudinal grooves Aj are connected to the channels of the blades.

The calibrator works as follows.

The cleaned flushing fluid from the internal cavity of the calibrator housing 1 flows under pressure into the through channels 2 and through the slots 4, which are. continuation of the pass-through channels 2, is output to the gaps formed

U9032

Between the borehole wall and the calibrating surface of the blades 3, Hz, an overpressure zone is created with the flushing fluid entering

5 through the channels 2 and the grooves 4, the pressure of the upflow of washing liquid.

The overpressure zone of the flushing fluid in the gap interferes with the penetration of the upstream flush fluid with sludge and metal fragments into it, leaching the rock destruction products from the gap by the calibrator itself.

15 improves gage cooling

the surface of the blades and reduces friction from the borehole walls, which increases the service life of the calibrator. Elimination of additional destruction

20 rocks, as well as centering the calibrator in the borehole by hydraulic pillows formed by excessive fluid pressure in the gaps between the borehole wall and the calibrating surface

25 blades, increase the efficiency of the calibrator.

five

Compiled by A. Sergachev Editor S. Lisin Tehred A. Babinets Corrector B :. Roshko

Order 892/46

Circulation 548

. VNSHSHI USSR State Committee

for inventions and discoveries 113035, Moscow, Raushsk nab. , d, 4/5

Branch 1ShP Patent, Uzhgorod, st. Project, 4

Fi..2.

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Claims (1)

VALVE CALIBRATOR containing a hollow body and blades mounted on it with channels facing the calibrating surface, characterized in that, in order to increase durability and increase its efficiency, the channels of each blade communicate with the internal cavity of the body, while on the calibrating surface of the blades are made blind longitudinal grooves communicating with the channels of the blades. FIG. At I